BMW i8 (2015) is 86 mm (3.39 inch) wider and 40 kg (88 lbs) lighter than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 224 mm (8.82 inch) longer, 220 mm (8.66 inch) higher and has 406 liters (14.34 ft3) bigger cargo space than BMW i8 (2015).